\u4e0b\u9762\u6765\u770b\u770b\u5404\u4e2a\u529f\u80fd\u7684\u5b9e\u73b0\uff1a<\/p>\n
\u9996\u5148\u5b9a\u4e49\u4e00\u4e2astring\u7684\u53e5\u67c4\uff0c\u76f8\u5f53\u4e8eC++\u4e2d\u7684\u5b9e\u4f8b<\/p>\n
struct c_string; \r\ntypedef struct c_string c_string_t; <\/pre>\n\u5728\u5185\u90e8string\u7684\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n
\r\n\/\/ string\u7684\u521d\u59cb\u5185\u5b58\u5927\u5c0f \r\nstatic const size_t c_string_min_size = 32; \r\nstruct c_string { \r\n char *str; \/\/ \u5b57\u7b26\u4e32\u6307\u9488 \r\n size_t alloced; \/\/ \u5df2\u5206\u914d\u7684\u5185\u5b58\u5927\u5c0f \r\n size_t len; \/\/ \u5b57\u7b26\u4e32\u7684\u5b9e\u9645\u957f\u5ea6 \r\n}; <\/pre>\n\u521b\u5efa\u5b57\u7b26\u4e32\uff1a<\/p>\n
\r\nc_string_t *c_string_create(void) { \r\n c_string_t *cs; \r\n cs = calloc(1, sizeof(*cs)); \r\n cs->str = malloc(c_string_min_size); \r\n *cs->str = '\\0'; \r\n \/\/ \u521d\u59cb\u5206\u914d\u5185\u5b58\u5927\u5c0f\u662f32\uff0c\u4e4b\u540e\u6bcf\u6b21\u4ee52\u500d\u5927\u5c0f\u6269\u5bb9 \r\n cs->alloced = c_string_min_size; \r\n cs->len = 0; \r\n return cs; \r\n} <\/pre>\n\u9500\u6bc1\u5b57\u7b26\u4e32\uff1a<\/p>\n
\r\nvoid c_string_destroy(c_string_t *cs) { \r\n if (cs == NULL) return; \r\n free(cs->str); \r\n free(cs); \r\n} <\/pre>\n\u5185\u90e8\u5982\u4f55\u6269\u5bb9\u5462\uff1a<\/p>\n
\r\nstatic void c_string_ensure_space(c_string_t *cs, size_t add_len) { \r\n if (cs == NULL || add_len == 0) return; \r\n if (cs->alloced >= cs->len + add_len + 1) return; \r\n while (cs->alloced < cs->len + add_len + 1) { \r\n cs->alloced <<= 1; \/\/ \u6bcf\u6b21\u4ee52\u500d\u5927\u5c0f\u6269\u5bb9 \r\n if (cs->alloced == 0) { \r\n \/\/ \u5de6\u79fb\u5230\u6700\u540e\u53ef\u80fd\u4f1a\u53d8\u4e3a0\uff0c\u7531\u4e8ealloced\u662f\u65e0\u7b26\u53f7\u578b\uff0c\u51cf\u4e00\u5219\u4f1a\u53d8\u6210UINT_MAX \r\n cs->alloced--; \r\n } \r\n } \r\n cs->str = realloc(cs->str, cs->alloced); \r\n} <\/pre>\n\u5728\u5c3e\u90e8\u8ffd\u52a0\u5b57\u7b26\u4e32\uff1a<\/p>\n
\r\nvoid c_string_append_str(c_string_t *cs, const char *str, size_t len) { \r\n if (cs == NULL || str == NULL || *str == '\\0') return; \r\n if (len == 0) len = strlen(str); \r\n c_string_ensure_space(cs, len); \/\/ \u786e\u4fdd\u5185\u90e8\u6709\u8db3\u591f\u7684\u7a7a\u95f4\u5b58\u50a8\u5b57\u7b26\u4e32 \r\n memmove(cs->str + cs->len, str, len); \r\n cs->len += len; \r\n cs->str[cs->len] = '\\0'; \r\n} <\/pre>\n\u5728\u5c3e\u90e8\u8ffd\u52a0\u5b57\u7b26\uff1a<\/p>\n
\r\nvoid c_string_append_char(c_string_t *cs, char c) { \r\n if (cs == NULL) return; \r\n c_string_ensure_space(cs, 1); \r\n cs->str[cs->len] = c; \r\n cs->len++; \r\n cs->str[cs->len] = '\\0'; \r\n} <\/pre>\n\u5728\u5c3e\u90e8\u8ffd\u52a0\u6574\u6570\uff1a<\/p>\n
\r\nvoid c_string_append_int(c_string_t *cs, int val) { \r\n char str[12]; \r\n if (cs == NULL) return; \r\n snprintf(str, sizeof(str), \"%d\", val); \/\/ \u6574\u6570\u8f6c\u4e3a\u5b57\u7b26\u4e32 \r\n c_string_append_str(cs, str, 0); \r\n} <\/pre>\n\u5728\u5934\u90e8\u63d2\u5165\u5b57\u7b26\u4e32\uff1a<\/p>\n
\r\nvoid c_string_front_str(c_string_t *cs, const char *str, size_t len) { \r\n if (cs == NULL || str == NULL || *str == '\\0') return; \r\n if (len == 0) len = strlen(str); \r\n c_string_ensure_space(cs, len); \r\n memmove(cs->str + len, cs->str, cs->len); \r\n memmove(cs->str, str, len); \r\n cs->len += len; \r\n cs->str[cs->len] = '\\0'; \r\n} <\/pre>\n\u5728\u5934\u90e8\u63d2\u5165\u5b57\u7b26\uff1a<\/p>\n
\r\nvoid c_string_front_char(c_string_t *cs, char c) { \r\n if (cs == NULL) return; \r\n c_string_ensure_space(cs, 1); \r\n memmove(cs->str + 1, cs->str, cs->len); \r\n cs->str[0] = c; \r\n cs->len++; \r\n cs->str[cs->len] = '\\0'; \r\n} <\/pre>\n\u5728\u5934\u90e8\u63d2\u5165\u6574\u6570\uff1a<\/p>\n
\r\nvoid c_string_front_int(c_string_t *cs, int val) { \r\n char str[12]; \r\n if (cs == NULL) return; \r\n snprintf(str, sizeof(str), \"%d\", val); \r\n c_string_front_str(cs, str, 0); \r\n} <\/pre>\n\u6e05\u7a7a\u5b57\u7b26\u4e32\uff1a<\/p>\n
\r\nvoid c_string_clear(c_string_t *cs) { \r\n if (cs == NULL) return; \r\n c_string_truncate(cs, 0); \r\n} <\/pre>\n\u88c1\u526a\u5b57\u7b26\u4e32\uff1a<\/p>\n
\r\nvoid c_string_truncate(c_string_t *cs, size_t len) { \r\n if (cs == NULL || len >= cs->len) return; \r\n cs->lenlen = len; \r\n cs->str[cs->len] = '\\0'; \r\n} <\/pre>\n\u5220\u9664\u5934\u90e8\u7684N\u4e2a\u5b57\u7b26\uff1a<\/p>\n
\r\nvoid c_string_drop_begin(c_string_t *cs, size_t len) { \r\n if (cs == NULL || len == 0) return; \r\n if (len >= cs->len) { \r\n c_string_clear(cs); \r\n return; \r\n } \r\n cs->len -= len; \r\n memmove(cs->str, cs->str + len, cs->len + 1); \r\n} <\/pre>\n\u5220\u9664\u5c3e\u90e8\u7684N\u4e2a\u5b57\u7b26\uff1a<\/p>\n
\r\nvoid c_string_drop_end(c_string_t *cs, size_t len) { \r\n if (cs == NULL || len == 0) return; \r\n if (len >= cs->len) { \r\n c_string_clear(cs); \r\n return; \r\n } \r\n cs->len -= len; \r\n cs->str[cs->len] = '\\0'; \r\n} <\/pre>\n\u83b7\u53d6\u5b57\u7b26\u4e32\u7684\u957f\u5ea6\uff1a<\/p>\n
\r\nsize_t c_string_len(const c_string_t *cs) { \r\n if (cs == NULL) return 0; \r\n return cs->len; \r\n} <\/pre>\n\u8fd4\u56de\u5b57\u7b26\u4e32\u6307\u9488\uff0c\u4f7f\u7528\u7684\u662f\u5185\u90e8\u7684\u5185\u5b58\uff1a<\/p>\n
\r\nconst char *c_string_peek(const c_string_t *cs) { \r\n if (cs == NULL) return NULL; \r\n return cs->str; \r\n} <\/pre>\n\u91cd\u65b0\u5206\u914d\u4e00\u5757\u5185\u5b58\u5b58\u50a8\u5b57\u7b26\u4e32\u8fd4\u56de\uff1a<\/p>\n
\r\nchar *c_string_dump(const c_string_t *cs, size_t *len) { \r\n char *out; \r\n if (cs == NULL) return NULL; \r\n if (len != NULL) *len = cs->len; \r\n out = malloc(cs->len + 1); \r\n memcpy(out, cs->str, cs->len + 1); \r\n return out; \r\n }<\/pre>\n\u6d4b\u8bd5\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n
\r\nint main() { \r\n c_string_t *cs = c_string_create(); \r\n c_string_append_str(cs, \"123\", 0); \r\n c_string_append_char(cs, '4'); \r\n c_string_append_int(cs, 5); \r\n printf(\"%s \\n\", c_string_peek(cs)); \r\n c_string_front_str(cs, \"789\", 0); \r\n printf(\"%s \\n\", c_string_peek(cs)); \r\n c_string_drop_begin(cs, 2); \r\n printf(\"%s \\n\", c_string_peek(cs)); \r\n c_string_drop_end(cs, 2); \r\n printf(\"%s \\n\", c_string_peek(cs)); \r\n c_string_destroy(cs); \r\n return 0; \r\n} \r\n\u8f93\u51fa\uff1a\r\n\r\n12345 \r\n78912345 \r\n912345 \r\n9123 \r\n\u5b8c\u6574\u4ee3\u7801\u5982\u4e0b\uff1a\u5934\u6587\u4ef6\uff1a\r\n\r\n#include \r\nstruct c_string; \r\ntypedef struct c_string c_string_t; \r\nc_string_t *c_string_create(void); \r\nvoid c_string_destroy(c_string_t *cs); \r\nvoid c_string_append_str(c_string_t *cs, const char *str, size_t len); \r\nvoid c_string_append_char(c_string_t *cs, char c); \r\nvoid c_string_append_int(c_string_t *cs, int val); \r\nvoid c_string_front_str(c_string_t *cs, const char *str, size_t len); \r\nvoid c_string_front_char(c_string_t *cs, char c); \r\nvoid c_string_front_int(c_string_t *cs, int val); \r\nvoid c_string_clear(c_string_t *cs); \r\nvoid c_string_truncate(c_string_t *cs, size_t len); \r\nvoid c_string_drop_begin(c_string_t *cs, size_t len); \r\nvoid c_string_drop_end(c_string_t *cs, size_t len); \r\nsize_t c_string_len(const c_string_t *cs); \r\nconst char *c_string_peek(const c_string_t *cs); \r\nchar *c_string_dump(const c_string_t *cs, size_t *len); <\/pre>\n\u6e90\u6587\u4ef6\uff1a<\/p>\n
\r\n#include \r\n#include \r\n#include \r\n#include \r\n#include \r\nstatic const size_t c_string_min_size = 32; \r\nstruct c_string { \r\n char *str; \r\n size_t alloced; \r\n size_t len; \r\n}; \r\nc_string_t *c_string_create(void) { \r\n c_string_t *cs; \r\n cs = calloc(1, sizeof(*cs)); \r\n cs->str = malloc(c_string_min_size); \r\n *cs->str = '\\0'; \r\n cs->alloced = c_string_min_size; \r\n cs->len = 0; \r\n return cs; \r\n} \r\nvoid c_string_destroy(c_string_t *cs) { \r\n if (cs == NULL) return; \r\n free(cs->str); \r\n free(cs); \r\n} \r\nstatic void c_string_ensure_space(c_string_t *cs, size_t add_len) { \r\n if (cs == NULL || add_len == 0) return; \r\n if (cs->alloced >= cs->len + add_len + 1) return; \r\n while (cs->alloced < cs->len + add_len + 1) { \r\n cs->alloced <<= 1; \r\n if (cs->alloced == 0) { \r\n cs->alloced--; \r\n } \r\n } \r\n cs->str = realloc(cs->str, cs->alloced); \r\n} \r\nvoid c_string_append_str(c_string_t *cs, const char *str, size_t len) { \r\n if (cs == NULL || str == NULL || *str == '\\0') return; \r\n if (len == 0) len = strlen(str); \r\n c_string_ensure_space(cs, len); \r\n memmove(cs->str + cs->len, str, len); \r\n cs->len += len; \r\n cs->str[cs->len] = '\\0'; \r\n} \r\nvoid c_string_append_char(c_string_t *cs, char c) { \r\n if (cs == NULL) return; \r\n c_string_ensure_space(cs, 1); \r\n cs->str[cs->len] = c; \r\n cs->len++; \r\n cs->str[cs->len] = '\\0'; \r\n} \r\nvoid c_string_append_int(c_string_t *cs, int val) { \r\n char str[12]; \r\n if (cs == NULL) return; \r\n snprintf(str, sizeof(str), \"%d\", val); \r\n c_string_append_str(cs, str, 0); \r\n} \r\nvoid c_string_front_str(c_string_t *cs, const char *str, size_t len) { \r\n if (cs == NULL || str == NULL || *str == '\\0') return; \r\n if (len == 0) len = strlen(str); \r\n c_string_ensure_space(cs, len); \r\n memmove(cs->str + len, cs->str, cs->len); \r\n memmove(cs->str, str, len); \r\n cs->len += len; \r\n cs->str[cs->len] = '\\0'; \r\n} \r\nvoid c_string_front_char(c_string_t *cs, char c) { \r\n if (cs == NULL) return; \r\n c_string_ensure_space(cs, 1); \r\n memmove(cs->str + 1, cs->str, cs->len); \r\n cs->str[0] = c; \r\n cs->len++; \r\n cs->str[cs->len] = '\\0'; \r\n} \r\nvoid c_string_front_int(c_string_t *cs, int val) { \r\n char str[12]; \r\n if (cs == NULL) return; \r\n snprintf(str, sizeof(str), \"%d\", val); \r\n c_string_front_str(cs, str, 0); \r\n} \r\nvoid c_string_clear(c_string_t *cs) { \r\n if (cs == NULL) return; \r\n c_string_truncate(cs, 0); \r\n} \r\nvoid c_string_truncate(c_string_t *cs, size_t len) { \r\n if (cs == NULL || len >= cs->len) return; \r\n cs->lenlen = len; \r\n cs->str[cs->len] = '\\0'; \r\n} \r\nvoid c_string_drop_begin(c_string_t *cs, size_t len) { \r\n if (cs == NULL || len == 0) return; \r\n if (len >= cs->len) { \r\n c_string_clear(cs); \r\n return; \r\n } \r\n cs->len -= len; \r\n \/* +1 to move the NULL. *\/ \r\n memmove(cs->str, cs->str + len, cs->len + 1); \r\n} \r\nvoid c_string_drop_end(c_string_t *cs, size_t len) { \r\n if (cs == NULL || len == 0) return; \r\n if (len >= cs->len) { \r\n c_string_clear(cs); \r\n return; \r\n } \r\n cs->len -= len; \r\n cs->str[cs->len] = '\\0'; \r\n} \r\nsize_t c_string_len(const c_string_t *cs) { \r\n if (cs == NULL) return 0; \r\n return cs->len; \r\n} \r\nconst char *c_string_peek(const c_string_t *cs) { \r\n if (cs == NULL) return NULL; \r\n return cs->str; \r\n} \r\nchar *c_string_dump(const c_string_t *cs, size_t *len) { \r\n char *out; \r\n if (cs == NULL) return NULL; \r\n if (len != NULL) *len = cs->len; \r\n out = malloc(cs->len + 1); \r\n memcpy(out, cs->str, cs->len + 1); \r\n return out; \r\n} \r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"\u4f17\u6240\u5468\u77e5\uff0cC++ \u4e2d\u7684string\u4f7f\u7528\u6bd4\u8f83\u65b9\u4fbf\uff0c\u5173\u4e8eC++ \u4e2d\u7684string\u6e90\u7801\u5b9e\u73b0\u53ef\u4ee5\u770b\u6211\u7684\u8fd9\u7bc7\u6587\u7ae0\uff1a\u6e90\u7801\u5206 […]<\/p>\n","protected":false},"author":317,"featured_media":153461,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[55],"tags":[],"class_list":["post-230611","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-thread"],"acf":[],"_links":{"self":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/230611","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/users\/317"}],"replies":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/comments?post=230611"}],"version-history":[{"count":2,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/230611\/revisions"}],"predecessor-version":[{"id":230614,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/posts\/230611\/revisions\/230614"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media\/153461"}],"wp:attachment":[{"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/media?parent=230611"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/categories?post=230611"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lrxjmw.cn\/wp-json\/wp\/v2\/tags?post=230611"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}